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參數(shù)資料
| 型號(hào)： | AK4648EC |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with MIC/HP/SPK-AMP |
| 中文描述： | 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷 |
| 文件頁(yè)數(shù)： | 72/119頁(yè) |
| 文件大小： | 1272K |
| 代理商： | AK4648EC |
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[AK4648]
MS0625-E-01
2007/06
- 72 -
When the HPMTN bit is “0”, common voltages of Headphone-Amp and common buffer for Headphone-Amp fall and
HPL, HPR and HVCM pins go to “L” (VSS2). When the HPMTN bit is “1”, the common voltages rises to HVDD/2 at
VBAT bit = “0”. A capacitor between the MUTET pin and ground reduces pop noise at power-up. Rise/Fall time constant
is in proportional to HVDD voltage and the capacitor at MUTET pin.
HPMTN bit= “0”
“1”
HVDD
MUTET pin
typ.
3.6V
120ms
4.2V
-
5.0V
-
3.6V
260ms
4.2V
-
5.0V
-
Note 62. Rising time of HP-Amp (0.8 x HVDD/2)
Note 63. Time until the common voltage goes to VSS2.
Table 61. Relationship between capacitor value of MUTET pin and MUTE ON/OFF time (VBAT bit = “0”)
When PMHPL, PMHPR, and PMHPC bits are “0”, the Headphone-Amp is powered-down, and HPL, HPR, HVCM pins
go to “L” (VSS2).
PMHPL bit,
PMHPR bit
PMHPC bit
(Note 62)
HPMTN bit = “1”
“0”
(Note 63)
typ.
140ms
-
-
310ms
-
-
Capacitor value of
max
210ms
230ms
260ms
460ms
500ms
550ms
max.
260ms
270ms
290ms
560ms
570ms
590ms
1
μ
F
±
30%
2.2
μ
F
±
30%
(1) (2)
(4)
(3)
HPMTN bit
HPL pin,
HPR pin,
HVCM pin
Figure 54. Power-up/down sequence for Headphone-Amp (Pseudo Cap-less Mode)
(1)
Headphone-Amp power-up (PMHPL=PMHPR=PMHPC bits = “1”). Outputs are still VSS2.
(2)
Headphone-Amp common voltage rises up (HPMTN bit = “1”). Common voltage of Headphone-Amp is rising.
(3)
Headphone-Amp common voltage falls down (HPMTN bit = “0”). Common voltage of Headphone-Amp is falling.
(4)
Headphone-Amp power-down (PMHPL=PMHPR=PMHPC bits = “0”). Outputs become VSS2. If the power supply
is switched off or Headphone-Amp is powered-down before the common voltage goes to VSS2, some POP noise
occurs.
<Headphone-Amp PSRR>
When HVDD is directly supplied from the battery in the mobile phone system, RF noise may influences headphone
output performance. When VBAT bit is set to “1”, HP-Amp PSRR for the noise applied to HVDD is improved. In this
case, HP-Amp common voltage is 0.64 x AVDD (typ.). When AVDD is 3.3V, common voltage is 2.1V. Therefore, when
HVDD voltage becomes lower than 4.2V, the output signal will be clipped.
VBAT bit
0
Common Voltage [V]
0.5 x HVDD
Table 62. HP-Amp Common Voltage
1
0.64 x AVDD
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4649 | 制造商:AKM 制造商全稱:AKM 功能描述:24bit Stereo CODEC with MIC/SPK-AMP |
| AK4649ECB | 制造商:AKM 制造商全稱:AKM 功能描述:24bit Stereo CODEC with MIC/SPK-AMP |
| AK4649VN | 功能描述:IC CODEC AUDIO 32QFN 制造商:akm semiconductor inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):初步 類型:音頻 數(shù)據(jù)接口:I2C 分辨率（位）:24 b ADC/DAC 數(shù):1 / 1 三角積分:- 信噪比，ADC/DAC（db）（典型值）:- 動(dòng)態(tài)范圍，ADC/DAC（db）（典型值）:- 電壓 - 電源，模擬:3 V ~ 3.6 V 電壓 - 電源，數(shù)字:3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:32-WFQFN 裸露焊盤 供應(yīng)商器件封裝:32-QFN（5x5） 標(biāo)準(zhǔn)包裝:1,000 |
| AK4650 | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
| AK4650VG | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit ツヒ CODEC with MIC/HP/SPK-AMP & TSC |
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